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The determination of the Ba abundance in globular cluster (GC) stars is avery powerful test to address several issues in the framework of multiplepopulation scenarios. We measured the Ba content for a sample of more than 1200stars in 15 Galactic GCs, using high-resolution FLAMES/Giraffe spectra. Wefound no variation in [Ba/Fe] ratios for different stellar populations withineach cluster; this means that low-mass asymptotic giant branch stars do notsignificantly contribute to the intra-cluster pollution. Very interestingly, weobtained that the fraction of Ba-stars in first generation (FG) stars is closeto the values derived for field stars ($\sim$2\%); on the other hand, secondgeneration (SG) stars present a significant lower fraction. An independent andsuccessful test, based on radial velocity variations among giant stars inNGC~6121, confirms our finding: the binary fraction among FG stars is about$\sim$12\% to be compared with $\sim$1\% of SG stars. This is an evidence thatSG stars formed in a denser environment, where infant mortality of binarysystems was particularly efficient.

Ba stars and other binaries in first and second generation stars in globular clusters